CN203159304U - Automatic control device of ammonification of condensed water - Google Patents

Abstract

The utility model discloses an automatic control device for adding ammonia to condensed water, which comprises a raw material tank, a frequency conversion speed regulator, and the first and second ammonia pumps. The outlet of the system condensate polishing treatment is connected, and a pH automatic detection sensor is provided in the ammonia addition point of the outlet of the condensate polishing treatment of the boiler system, and a liquid level automatic detection sensor is provided in the liquid storage tank, and the pH automatic detection sensor The liquid level automatic detection sensor is connected with a control cabinet, and the control cabinet is electrically connected with a frequency converter, and the frequency converter is electrically connected with the ammonia pump 1 and the ammonia pump 2. According to the pH value and liquid level value, the control cabinet controls the frequency conversion governor to adjust the speed of the ammonia addition pump 1 and the ammonia addition pump 2 to achieve automatic control of ammonia addition. The utility model is an automatic control device for adding ammonia to condensed water with simple operation and safe and reliable control, which can realize the automation, controllability and safe and economical operation of the ammonia adding system to condensed water to the greatest extent.

Description

Condensed water and ammonia automatic control device

technical field

The utility model relates to an automatic control device for adding ammonia, in particular to an automatic control device for adding ammonia to condensed water. the

Background technique

The purpose of adding ammonia to condensed water in thermal power plant boilers is mainly to adjust and maintain the pH value of condensed water, and reduce the corrosion of condensed water or water supply system caused by too high or too low pH value. For systems with copper, if the pH value is too high, it may cause passivation corrosion to the copper system, so the power plant has relatively strict control requirements for the pH value of condensed water. The ammonia addition point of condensate is generally located at the outlet of the condensate pump or on the condensate jellyfish pipe. At present, most thermal power plant boiler ammonia dosing control systems still adopt manual dosing mode, but with the requirements of process control and the improvement of automatic control technology, most thermal power plants have required boiler condensate water ammonia dosing to realize automatic control, adding The ammonia automatic control system has the functions of stable and reliable operation, strong control function, convenient and simple data collection and recording, and high precision of dosing amount. At the same time, it can also reduce the labor intensity of manual ammonia addition. the

Contents of the invention

The technical problem to be solved by the utility model is to provide an automatic control device for adding ammonia to condensed water with stable and reliable operation, strong control function and network. the

In order to solve the above-mentioned technical problems, the utility model provides an automatic control device for adding ammonia to condensed water, which includes an ammonia adding tank, a liquid storage tank, a frequency conversion governor, and ammonia adding pump one and ammonia adding pump two, the ammonia adding pump The outlets of the first and second ammonia pumps are connected to the condensate polishing outlet pipeline, and the pH value automatic detection sensor is installed at the ammonia addition point of the condensate polishing outlet, and the liquid level automatic detection sensor is installed in the liquid storage tank , the liquid storage tank is connected to the regulating valve, the pH value automatic detection sensor and the liquid level automatic detection sensor are electrically connected to the control cabinet, the control cabinet is electrically connected to the frequency converter, and the regulating valve is connected to the The frequency conversion speed regulators are connected, and the ammonia addition pump 1 and the ammonia addition pump 2 are both electrically connected to the frequency conversion speed regulators. the

The automatic control device for adding ammonia to condensed water adopts the above technical scheme, the pH automatic detection sensor transmits the pH value detected at the outlet of the condensate polishing treatment to the control cabinet, and the liquid level automatic detection sensor transmits the detected liquid level information to the control cabinet, and the system The design takes the pH value detected at the outlet of condensate polishing treatment as the first control parameter to output the control signal after the PLC application control algorithm in the control cabinet, control the frequency converter, drive the frequency converter, adjust the ammonia pump 1 and the fuel tank. The flow rate of ammonia pump 2 achieves the purpose of automatic control of ammonia addition. At the same time, the liquid level information detected in the liquid storage tank is used as the second parameter to know the liquid level information in the liquid storage tank in time and to take corresponding supplementary ammonia liquid according to the information. After adopting the utility model, only the staff need to monitor the control interface in the central control room, which not only reduces the labor intensity, but also realizes the automation, controllability and safe and economical operation of the condensed water ammonia addition system. the

In summary, the utility model is an automatic control device for condensed water ammonia addition with simple operation, safe and reliable control, which can maximize the automation, controllability, safe and economical operation of the condensed water ammonia addition system. the

Description of drawings

Fig. 1 is the structural representation of the utility model. the

Fig. 2 is the automatic ammonia addition control block diagram of the present utility model. the

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment, the utility model is further described. the

Referring to Fig. 1 and Fig. 2, the outlet of the raw material tank 1 is connected to the inlet of the liquid storage tank 4 through the control valve 2, and the liquid storage tank 4 is provided with a dilution water inlet 3, a solution mixer 5 and a liquid level automatic detection sensor 12, and the liquid storage tank The outlet of 4 is connected to the frequency conversion governor 7 through the control valve 6, and the frequency conversion governor 7 is electrically connected to the ammonia addition pump 1 8 and the ammonia addition pump 2 9, and the ammonia addition pump 1 8 and the ammonia addition pump 2 9 are connected to the condensed water The ammonia addition point 10 at the outlet of the finishing treatment is connected to the ammonia addition point 10 at the outlet of the condensate polishing treatment. 11 is electrically connected with the frequency converter 7. the

Referring to Fig. 1 and Fig. 2, ammonium hydroxide stoste is housed in raw material tank 1, stoste enters liquid storage tank 4 through control valve 2, and the dilution water that enters with dilution water inlet 3 is mixed through solution mixer 5, is adjusted to set The pH value detected in the ammonia addition point 10 at the condensate polishing outlet is transmitted to the control cabinet 11, the liquid level value detected in the liquid storage tank is transmitted to the control cabinet 11, and the control cabinet 11 passes the detected pH value through The PLC in the control cabinet outputs the control signal after applying the control algorithm, controls the frequency converter, drives the frequency converter, adjusts the dosing amount of the ammonia addition pump 1 8 and the ammonia addition pump 2 9, and at the same time the control cabinet 11 will detect the The liquid level value is compared with the lowest liquid level that the liquid storage tank 4 can tolerate to control the amount of ammonia liquid added. After adopting the utility model, only the staff need to monitor the control interface in the centralized control room, which not only reduces the labor intensity, but also realizes the automation, controllability and safe and economical operation of the condensed water ammonia addition system. the

Main functions of the utility model: automatic detection of pH value and solution liquid level, automatic, manual and automatic manual switching of ammonia addition. Main technical indicators: ① Detection index: pH measurement range: 0-14, water sample temperature 0-60 ℃; ② Control index: pH after ammonia addition at the outlet of condensate polishing: 9.0-9.4. the

The technical route of the utility model. the

The ammonia addition system is regulated by using the pH value of the outlet of the condensate polishing treatment and the liquid level value in the liquid storage tank, and adopts the method of combining AC frequency conversion technology and PLC control technology to eliminate the influence of the hysteresis factor of the manual ammonia addition signal and realize the condensate addition. The automation, controllability and safe and economical operation of the ammonia system. The specific implementation steps are as follows. the

1. The ammonia liquid in the liquid storage tank 4 is adjusted to the corresponding pH value by calculating the relationship between the ammonium hydroxide and the amount of dilution water. the

2. According to the deviation between the pH value detected at the ammonia addition point 10 at the outlet of the condensate polishing treatment and the given value, the control amount is obtained through the PLC control algorithm program, and the control amount is kept within the range of its set value. the

3. The control cabinet 11 controls the frequency conversion speed regulator 7 to perform frequency conversion and speed regulation through the output of the control quantity obtained by the PLC control algorithm program. the

4. Check and correct the pH meter at the ammonia addition point 10 at the condensate polishing outlet and the liquid level meter in the liquid storage tank 4. the

5. Transmit the output signals of the pH value automatic detection sensor 13 of the ammonia addition point 10 at the condensate polishing outlet and the liquid level automatic detection sensor 12 in the liquid storage tank to the control cabinet 11 . the

6. Electrically connect the power supplies of the dosing pumps 8 and 9 to the frequency converter 7. the

7. Debug and test run the condensed water automatic ammonia addition device, and further adjust the control parameters to make the system run safely and stably. the

8. The pH value automatic detection sensor 13 transmits the pH value detected by the condensate polishing outlet 10 to the control cabinet 11, and the liquid level value detected by the liquid level automatic detection sensor 12 in the liquid storage tank 4 is transmitted to the control cabinet 11 to control The cabinet 11 compares the detected pH value with the control set value, and then transmits the control signal to the frequency converter 7 through the control amount obtained by the PLC control valve program in the control cabinet 11, and the frequency converter 7 controls the ammonia addition amount of ammonia addition pump one 8 and ammonia addition pump two 9. the

Claims (1)

1. condensed water ammonification automatic control device, comprise head tank (1), variable-frequence governor (7) and add ammonia pump one (8) and add ammonia pump two (9), it is characterized in that: the described ammonia pump one (8) that adds all is connected with the outlet of condensed water precision processing ammonification point (10) with the outlet that adds ammonia pump two (9), outlet ammonification point (10) in the condensed water precision processing of boiler systems is provided with the automatic detecting sensor of pH value (13), in container for storing liquid (4), be provided with liquid level sensor (12), the automatic detecting sensor of described pH (13) links to each other with housing (11) with the automatic detecting sensor of liquid level (12), described housing (11) is electrically connected with variable-frequence governor (7), described variable-frequence governor (7) with described add ammonia pump one (8) and add ammonia pump two (9) be electrically connected.

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